"[I] wasn't very happy," Madonna, 53, said of seeing the photos. "But honestly, I don't think I'm as tough as I should be [on my kids]. I think I need to be maybe tougher. It's hard — every day is a negotiation." (Madonna is also mom to Rocco, her 11 year old son with ex-husband Guy Ritchie, plus David, 6, and Mercy, 5, whom she adopted; Lourdes' dad is Madonna's former beau Carlos Leon.)

"But cigarette smoking I'm not very fond of for anyone," she added. "I don't approve of anyone smoking cigarettes — most of all my daughter."

Lourdes Leon smokes a cigarette with friends while out and about in New York City on March 23, 2012Splash News Online

Yet, as Smith points out in the interview, the pop queen herself smokes in her racy new "Girl Gone Wild" video.

"I don't smoke," she fired back with a big smirk on her face. "That's just an accessory, Harry. There's a difference. [Lourdes] smoked that cigarette before I did that video!"